A change of state in which gas becomes liquid by cooling.
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Energy
The capacity for doing work.
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Evaporation
The process in which a liquid changes state and turns into a gas.
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Freeze
A change of state in which liquid becomes solid by cooling.
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Horizontal
A line with zero slope.
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Internal Energy
The total kinetic energy and potential energy of the particles in an object.
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Kinectic Energy
Energy which an object possesses by being in motion.
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Melting
The process that occurs when a solid turns into a liquid when it is heated.
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Molecule
A collection of two or more atoms held together by chemical bonds.
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Particle
A general term for a small piece of matter. For example, protons, neutrons, electrons, atoms, ions or molecules.
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Specific Heat Capacity
The amount of energy needed to raise the temperature of 1 kg of substance by 1°C.
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Specific Latent Heat
The amount of energy needed to melt or vaporise 1 kg at its melting or boiling point.
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States of Matter
The three forms in which a substance can exist (solid, liquid, and gas).
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Sublimation
When a solid turns straight into a gas on heating, without becoming a liquid first - or when a gas turns straight into a solid, without becoming a liquid.
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